Is it a thing for guys to get a bit insecure after spending some quality time with their way better looking girlfriends?

Looks wise my girlfriend is leagues above me, and I'm actually fairly handsome and fit, my height is good as well (5'11") but she's like 5'10" and very beautiful, bless her.
I know it sounds dumb but I can't help but feel a bit insecure after seeing her. And I tend to pull back a bit when that happens.
Is it a thing for guys to get a bit insecure after spending some quality time with their way better looking girlfriends?
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